chr function missing on new laptop

[El Rebelde]

I've just set up my shiny new laptop, but one of my macros fails because the
CHR function is 'undefined' Is soemthing missing from my set up?

 

[BruceM]

Checking the references is a good place to start. This link has more
information:
http://allenbrowne.com/ser-38.html

 

[El Rebelde]

Many thanks!!